Programmable Home Security System using LDR (TDA2002)

2017-07-13 04:08

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This article describes the Programmable Home Security System using LDR (TDA2002). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:TDA2002.If you have a high-quality knowledge of the circuit, please contact us. We appreciate your sharing what you know schematic knowledge to us.

In this project we design low cost high performance programmable home securitysystemusing few LDR’s as an input sensors. When above sensor(s) get triggeredsystemmay dial the user specifiedphonenumber (using build-in DTMF generator) and activate the high power audioalarmand lights. All the parameters of DTMF generator, audioalarmand light interface are programmed through the RS232 serial interface.

Thissystemuses a Microchip’s PIC16F877A as a maincontroller, LM339 as sensor interface, UM3561 as a tone generator andμPC2002 (TDA2002) as a speaker driver (audio amplifier). LM7805, LM7812and LM317 voltage regulators are used to obtain 5V, 12V and 3Vrespectively.

AssemblyThe PCB design given with this article makes the assembly much simpler.As PCB contain 230V AC main lines care must be taken while assemblingthe circuit. As shown in the fig.1 all the photoelectric sensors, someof the switches andalarmspeaker are connected with the circuit through the connector bars.